Add missing alt property to image tags

[evaporei]

The img tags were missing the alt property which are important to blind people I guess, so I've added them.

However I don't know if they should be in portuguese or english, since the page has both languages. I've added in english since the whole code and properties are in english, but if you feel it should be in portuguese I can translate them 😉

[evaporei]

Okay, I just realised that there are two index.html, one for each language 😅
I guess I will move the work done here to en/index.html and create similar alt properties in portuguese for the original index.html.

[evaporei]

Fixed, both portuguese and english versions have alt attribute on images 🎉

[MarcoWorms]

Hey @otaviopace thanks a lot for the contribution!

Since the use of the alt tag is supposed to help blind people it would be nice if they have a human-like readability, so instead of using "lisp-case" we should have the alt text in "Normal Case" (idk how is this case type is formally called haha)

Thanks @heyvito that have pointed out to the alt standard: https://www.w3.org/TR/WCAG20-TECHS/H37.html

I can make the commit that changes what you have done to use Normal Case, just let me know if i can take over the PR or if you want to do it by yourself ;)

[MarcoWorms]

change requested: replace casing for all instances of alt-text

example of how it is as of now:
alt="hash-menu-logo"

example of how it is expected to be:
alt="Hash Menu Logo"

[evaporei]

Okay, I will change then 🙂

[heyvito]

Since the use of the alt tag is supposed to help blind people it would be nice if they have a human-like readability, so instead of using "lisp-case" we should have the alt text in "Normal Case" (idk how is this case type is formally called haha)

@MarcoWorms Just for curiosity's sake, it is called "Sentence case". Nothing special, and actually quite infuriating it doesn't have a better name. There you go. Now you know how it is formally called. 😛

[evaporei]

"Sentence case" also know as phrase 😂
So I've fixed the issues, you can review if the alt text is good.
Thanks for the knowledge btw 🙂